OP posited that the author didn't know what he's talking about. I pointed out that the author has far more knowledge and experience in the field than rando internet griefers on HN who immediately reach for "shoot the messenger" when they read something that doesn't neatly fit into their pre-conceived worldview, instead of perhaps learning things from other people.
But at least your trope acknowledges that he's an authority on the subject.
There's nothing wrong to point that out but to use it as evidence of a truth as if it is a logical argument is the fallacy.
"Richard Dawkins certainly knows about evolution, and he can confidently tell us that it is true, but that doesn't make it true. What makes it true is the preponderance of evidence for the theory."
OP posited that the author didn't know what he's talking about. I pointed out that the author has far more knowledge and experience in the field than rando internet griefers on HN who immediately reach for "shoot the messenger" when they read something that doesn't neatly fit into their pre-conceived worldview, instead of perhaps learning things from other people.
But at least your trope acknowledges that he's an authority on the subject.